What is a false alarm?

An action is planned in response to specific earthquake conditions, such as when ground shaking will be severe. A false alarm is when an earthquake warning causes that action to be taken, but the conditions weren't met.

What is a missed alarm?

An action is planned in response to specific earthquake conditions, such as when ground shaking will be severe. A missed alarm is when that action is not taken, even though the conditions were met.

How will you know what to do when you hear a warning?

Emergency managers will determine the best response to earthquake warning in each situation in which you may find yourself. You will receive training.

How is earthquake warning being used?

Our earthquake warning has been used in California since 2001. See real world examples.